Morphologic Relationships Between Enamel and Dentin Surfaces of Lower First Molar Teeth

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Abstract
Measurements were taken between apices of cusps of 50 lower first molars taken from prehistoric Arizona crania. The same measurements were taken on the cuspal apices of the dentin surface after enamel was removed. Comparisons between enamel and dentin surfaces showed: a consistently smaller entaconid angle for both surfaces; a greater correlation in angulation between enamel and dentin apices at the entaconid; a consistently larger enamel apical perimeter, both relatively and absolutely; the hypoconid-entaconid apical diameter is the largest on both surfaces; the enamel apices show more linguo-buccal than mesio-distal displacement relative to their dentin homologues; there is no apparent bilateral symmetry displayed in the various enamel and dentin bi-apical relationships; mean maximum crown width and length for the dentin are nearly equal, but for the enamel the mean max. length was significantly greater The metrical and topical differences between enamel and dentin surfaces are perhaps the expression of genetic enamel growth factors which apparently operate unilaterally.

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